[5]Helicene-Scaffold Fluorescence Sensing for Selective Detection of Au3+ Ions and Gold Nanoparticle

A new quenching fluorescence sensor (MDP) with high productivity was easily synthesized from a [5]helicene anhydride derivative and propargyl bromide. This MDP sensor has significant photophysical properties, including high fluorescence emission and a large Stokes shift, and it exhibits selectivity and an excellent detection response in distinguishing Au3+ ions from interfering metal ions in aqueous solution. The limit of detection of the sensor were determined to be 0.16 µmol L-1 or 32.0 ppb. Stoichiometric binding between the MDP and Au3+ ions was found to occur at a 1:2 ratio. Additionally, the MDP sensor shows an ability to detect gold ions in real water samples and recognize gold nanoparticles (AuNPs), which invites its further application in biological and environmental systems.

Room temperature phosphorescence of 4-bromo-1,8-naphthalic anhydride derivative-based polyacrylamide copolymer with photo-stimulated responsiveness

Room temperature phosphorescence emission was achieved by host–guest recognition between γ-cyclodextrin and a 4-bromo-1,8-naphthalic anhydride polymer, which can be controlled by the photo-isomerization of the azobenzene unit of the other polymer.

RAFT synthesis of poly(vinylpyrrolidone) amine and preparation of a water-soluble C60-PVP conjugate

A well-defined C60-PVP conjugate with a sufficient water-solubility was successfully synthesized by RAFT polymerization of NVP and subsequent reaction with a C60 acid anhydride derivative.

Biotin-conjugated N-methylisatoic anhydride: a chemical tool for nucleic acid separation by selective 2′-hydroxyl acylation of RNA

An isatoic anhydride derivative, bearing a biotin and a disulfide linker, was specifically designed for separation of nucleic acids by a selective 2′-hydroxyl acylation of RNA.